package j03tongpeifu;

class Fa1<T>{
    T t;
}

public class J2 {
    public static void main(String[] args) {
        Fa1<String> fa1 = new Fa1<>();
        fa1.t="abc";
        System.out.println("fa1.t.length() = " + fa1.t.length());

//        Fa1<?> fa2 = fa1;
//        fa2.t.length();
    }
}

